4.Land subsidence survey found that the area of Bangkok. The settlement due to groundwater to bring up, use in consumer เกินกว่าปริมาณ water flows back into the replacement rate of approximately. 5 - 10The Phra Khanong bangkapi and Huai khwang, so the ground of the pan. , which hinders the drainage from the cause can be seen. Increase the influence with the backing of the sea water and the other above mentioned above.. when the government tried to stop the use of this system. Bangkok's settlement until the water level is above the level support surface was almost three meters in B.Professor in August 2000, approximately, which will cause damage to the metropolitan increase respectively
5.Destruction of the drainage is naturally. Due to land use planning is strong and carefully. Change of drainage system of city canal from the nature to the piping system.In a manner or road block the flow direction of the water. The size of the drainage is not enough. These causes will result in flooding conditions in the Bangkok metropolitan area, in general, when there is heavy rain
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